| 摘要 |
PURPOSE:To measure concentration simply and quickly and to make the price of an apparatus inexpensive, by attaching dust to a sticking agent, and measuring the dust concentration in an atmosphere based on the amount of attachment. CONSTITUTION:Under the state a covering tube 7 covers a dust attaching sheet 12, an apparatus is set at a specified position in a flow path. When a rotating and driving motor 8 is started, the covering tube 7 is rotated and lifted up through a gear 9, a gear 5 and an outer pipe 4. The cover is slowly removed from the dust attaching sheet 12. The sheet is completely exposed at last. At the same time, a rotating and driving motor 13 is started, and the sheet 12 is rotated in the circumferential direction through a holding rod 10 and an inner tube 11, so that the dust is attached uniformly. After the specified time, the sheet 12 is covered by the tube 7 again. Thereafter, the entire apparatus is removed, the sheet 12 is removed from the inner tube 11 and the weight is measured. The difference between the result and the weight of the sheet 12 before the measurement is obtained, and the amount of the attached dust is measured. Thus the measurement can be performed simply and quickly, and the apparatus can be made inexpensive. |
